"Fight for a Friend", known as "The Immortal Spearman - Silent Honors Dark Knight" in the Japanese version, is the one-hundred and twenty-fifth episode of the Yu-Gi-Oh! ZEXAL anime. It first aired in Japan on October 13, 2013 and on Hulu on September 29, 2014.

Nash supplies the Seven Barian Emperors with the trump card of the Barians: "Rank-Up-Magic - The Seventh One". With this trump card, armed with the most menacing effect yet, the Seven Barian Emperors mount a full-scale battle against Quattro and the rest! Quattro's group find themselves overwhelmed by the Emperors' combined strength, but they all decide to use their full strength to protect Yuma and try and bring Shark back. Quattro, armed with his own trump card given to him by Quinton, unleashes a strategy to bring down Nash...!

Each of the human Duelists utters a short comment. Dextra and Bronk only say "Over-Hundred Chaos Number" in shock (in the dub, Dextra is not afraid of Dumon's new "Number", while Bronk knows the real Rio is still in Marin and promises to bring her back), but Nistro is pleased his blood is pumping now. Roku says they still have to win, while Kaze is worried about being disgraced in this Duel (in the dub, Roku says it is the darkest before dawn, and Kaze finishes his mentor's statement with the sun coming up just as the Barians are going down). Anna says they can't afford to lose, while Nelson tells Mizar to bring it on (in the dub, Nelson promises to serve justice to Mizar, while Anna adds that this justice will be explosive). Still watching the Duel, Vector is shocked at Nash's power. Don Thousand tells him that such power was impossible to attain until now and seems surprised that Nash could pass that power to the other Emperors (Thousand communicating with Vector is cut from the dub). Vector muses that with power like that, they should be able to beat the humans even if they gang up on them, but wonders if Nash can truly fight his friend.

Nash throws away his pendant, severing his link to humanity (this was removed from the dub).

Nash thinks back to just after he recovered his memories. Looking out at the abyss in the Barian World, still in his human form, he stares at the picture inside the pendant he wears around his neck, showing his human family. Rio approaches him, calling him "Reginald". She comments he's come back to this spot again, but he tells her not to call him that anymore. She asks if she should call him "Nash" now. With tears in her eyes, she states that the souls that were sent to the Barian World were burned in the fires of war and carried the weight of anger and sorrow. She blames herself for it, or rather, her actions in her previous life. Nash in turn blames himself, as his hatred in that life led them here, while ripping the pendant from his neck. Rio wonders if he can really fight against Yuma and the others. He responds with a yell that he will - as Nash, he will force himself to forget his own friends. He throws the pendant into the abyss, yelling "for the sake of the Barian World!" (this entire flashback was removed from the dub version.)

Back in the present, Nash activates the effect of "Silent Honor DARK", which lets him attach a monster his opponent controls to it as a Chaos Overlay Unit. Quattro comments that he doesn't even need to use an existing Overlay Unit to do this. Nash targets "Chaos Number 15: Gimmick Puppet Giant Hunter" and yells "Chaos Conversion" as "Silent Honor DARK" shoots a blast of pink energy from its lance, which engulfs "Giant Hunter" in a massive explosion, with the energy being brought back and made into a Chaos Overlay Unit. Nash boasts that this nonsense will end now and orders "Silent Honor DARK" to attackdirectly. It shoots another blast from its lance and Quattro is thrown backwards in the explosion. Nash says "Good-bye" as the attack hits. Vector remarks that Quattro lost quickly, but when the smoke clears, Quattro painfully gets to his feet. Quattro declares that he'll drag "Reginald" back no matter what. Even if he's accepted his fate, Quattro will beat sense into him. Nash asks how he survived and a monster appears in front of Quattro. He explains that when the attack of "Silent Honor DARK" was declared, he used the effect of the "Gimmick Puppet Shadow Feeler" in his Graveyard, Special Summoning it in Attack Position and making it the new attack target, with "Shadow Feeler" preventing its own destruction by battle. This reduced his Life Points to 100 - just enough to survive (shots of the actual "Shadow Feeler" are cut from the dub, though its silhouette is shown briefly).

Nash says it wasn't a bad move, but it makes him want to destroy Quattro even more. He ends his turn, commenting that he's surprised that the "cheating Champion of East Asia" was able to come this far. Quattro responds that he will keep going and reforge the bonds of friendship. Nash calls those bonds nonsense, adding that he's tired of pretending he was friends with anyone. Shocked, Quattro asks if he's serious, with Nash claiming that he was - he would never feel sentimental things such as bonds or friendship. He urges Quattro to hate him, to not think of him as a friend, but as an enemy he must defeat. Quattro responds that even if Nash believes the bonds of friendship are dead, he can still reforge them (in the dub, Quattro thinks Nash was telling the truth; he wasn't his friend in the past, but he will become the Barian leader's worst enemy in the present).

Quattro draws and then equips "Shadow Feeler" with "Overlay Satellite". A small satellite appears and begins to orbit "Shadow Feeler". Quattro explains that this allows the equipped monster to be treated as two Overlay Units. The satellite fires a blast and "Shadow Feeler" is duplicated. Quattro overlays his two Level 8 monsters to Xyz Summon "Number 40: Gimmick Puppet of Strings" in Attack Position, adding that "Overlay Satellite" now becomes an Overlay Unit, but that the Xyz Monster cannot attack this turn. Nash questions why he'd Summon a 3000 ATK monster that can't attack and adds that Quattro's words will never reach Nash's heart, no matter how loud they are (in the dub, Nash says he would never have a clueless person like Quattro as a friend). Quattro responds that he'll just have to make them echo so loudly that Nash will be forced to hear them, then. He activates the effect of "Strings", detaching an Overlay Unit to place a String Counter on all other monsters on the field. Red strings rain down and snare "Silent Honor DARK" and he explains that monsters with String Counters will be destroyed during Nash's next End Phase, inflicting damage to Nash equal to the destroyed monster's ATK.

He continues that "Shadow Feeler" banishes itself if it's detached and proceeds to activate "Banish Reactor" as one of his cards was banished. This lets him add a card from his Graveyard to his hand. He chooses "Rank-Up-Magic Argent Chaos Force". Nash quips that he wasted too much time and effort to bring back that "make-believe" Chaos card ("that phony meaningless card" in the dub). Quattro emphatically yells that this is a card his older brother entrusted him with, a card filled with the feelings of someone he believes in. He adds that even Nash should understand that and that he is pouring his heart and soul into this Duel. Nash questions why he's saying such strange things (in the dub, Quattro says that Dueling isn't about winning, and Nash points out that Quattro never believed in that concept back then) and Quattro reminds him that it was he and Yuma that turned him into such a person. Now, he wishes to return the favor and turn Nash back into the person he was before.

As Quattro activates "Argent Chaos Force", his crest radiates outward and he declares a Chaos Xyz Evolution, his face contorting in pain. He chants, "using the fruits of human wisdom, I revive the Devil" and "Chaos Number 40: Gimmick Puppet of Dark Strings" appears in Attack Position. Quattro immediately activates its effect, which destroys all monsters that have String Counters. Nash asks "what did you say?", while Quattro declares "Symphony of Destruction". "Gimmick Puppet of Dark Strings" fires a blast from its sword, which destroys "Silent Honor DARK" and Quattro reveals he'll take damage equal to the monster's ATK, determining that now his feelings will slap some sense back into Nash. As the explosion engulfs Nash, he's thrown backwards and reverts to his human form. He wonders to himself if these are truly Quattro's feelings before hitting the ground hard, his Life Points at 200 (Nash's thoughts are edited out in the dub). Quattro explains that the other effect of "Gimmick Puppet of Dark Strings" lets him draw a card whenever it destroys a monster.

Nash begins to rise, but wonders to himself again if Quattro's feelings are truly this strong (in the dub, Nash thinks that the angrier Quattro makes him, the harder he will hit back). Quattro speculates that since his body turned back to human form, Nash must have regained part of his heart. Nash rises and declares he's activating the effect of "Silent Honor DARK". When it is destroyed while it has Overlay Units, he can Special Summon it from his Graveyard. He shouts "Return from Oblivion" as "Silent Honor DARK" reappears and then explains that he now gains Life Points equal to the ATK of "Silent Honor DARK". A shining orb from the spear of "Silent Honor DARK" restores his Life Points to 3000. Quattro says he managed to pull himself back together, but adds that "Silent Honor DARK" has no Overlay Units now. He orders "Gimmick Puppet of Dark Strings" to attack, but Nash activates his face-down "Overlay Connection", which lets him attach that card to an Xyz Monster he controls with no Overlay Units. "Gimmick Puppet of Dark Strings" fires a burst from its sword, destroying "Silent Honor DARK" and reducing Nash to 2500 Life Points. Quattro determines that his words didn't reach Nash, then and draws another card as "Gimmick Puppet of Dark Strings" destroyed a monster. Nash claims "Silent Honor DARK" can revive an infinite amount of times and declares "Return from Oblivion" again, reviving "Silent Honor DARK" and increasing his Life Points to 5300.

Nash recalls the people he must protect.

Nash claims he is the "Barian's Guardian", the protector of a vast number of souls that have yet to mature (in the dub, Nash says as the Barian leader, the combined strength of the Barians is his). Behind him appear the members of the army of the United Lands of the Poseidon Ocean, their eyes glowing pink. Nash urges Quattro to give up - his words will never reach Nash's heart. Quattro responds he'll never give up no matter how many Life Points Nash has and that he's sure that Nash is still Reginald Kastle, no matter what he looks like (in the dub, Quattro disregards Nash's claims and proves that Shark's human form is starting to get through to him; it must be the Dueling that is bringing Shark back). Nash growls and Quattro Sets a card. Nash draws and orders "Silent Honor DARK" to absorb "Gimmick Puppet of Dark Strings". As it appears as a Chaos Overlay Unit, Vector comments to himself that humanity's short-lived hope ends here - the next attack will send Quattro to hell.

Nash allows Quattro to see how his allies fare.

Quattro activates his face-down "Panic Shuffle" as his Xyz Monster was targeted by an opponent's card effect. It switches all monsters on the field to Defense Position and prevent them from switching again until the End Phase. Then, all Spell and Trap Cards in both players' Graveyards will be returned to their respective Decks. Two Graveyard portals manifest and two yellow beams fire out of one into Nash's Deck, while five fire out of the other into Quattro's. Nash says he managed to stave off defeat a little longer and Sets a card to end his turn. Nash thinks to himself that even after throwing away his humanity, Quattro is still trying to reach him with his white-hot passion (in the dub, Nash thinks that now he is a Barian, he does not want to feel human again). His fist shaking, he thinks that he doesn't want that passion - he just wants Quattro to feel all-consuming hatred for him. Raising his arm, white energy discs radiate out from his hand and he tells Quattro that he wishes to show him something. Five screens appear in front of Quattro, where he can see the progress of the other Duels. Dextra vows that she can't give up yet as she gets to her feet. Bronk tells Yuma to wait for him - he will reforge his bonds with Rio (in the dub, Bronk says he is down, but not out just yet). Nistro tells Alito that no matter how many times he is punched, he will continue to rise for Yuma's sake (in the dub, Nistro promises to go all-out against his opponent). Kaze claims that even if their bodies perish, the "blades of their hearts" will never shatter (in the dub, Kaze says that even if his monsters are destroyed, his spirit will never be crushed). Roku agrees and says they'll protect Yuma even at the cost of their lives. Nelson claims that justice can never lose and Anna adds that love will always win and that she'll protect Yuma no matter what. Pointing at Mizar, she tells him to bring it on.

In the car, Yuma finally regains consciousness, causing Tori to giggle happily. He struggles to speak and Cathy says she's glad to see he's alright. Yuma asks if everyone else is okay. Astral mutters his name, but Caswell perks up and claims that everyone is fine. Yuma mutters that he understands before closing his eyes again. Nash asks if Quattro is worried about what will become of his other friends and says that it is his "fanservice" to him (in the dub, Nash taunts Quattro by pointing out that his friends are failing miserably). A large energy blast hits Anna and Nelson, reducing them both to 0 Life Points. As "Neo Galaxy-Eyes Tachyon Dragon" vanishes, Mizar simply says "farewell." Anna apologizes to Yuma, while Nelson expresses shock that the "hero of justice" has lost (in the dub, Nelson mutters that the good guys do not always win). They both vanish and their souls fly towards the Barian World. Girag claims that no matter what his opponents do, they are helpless before "Giant Red Hand". Clasping his fist, he says he will crush them in the palm of his hand. A large fire attack hits both Roku and Kaze, with Kaze saying he has no regrets before vanishing. Roku apologizes to Yuma, disappointed that he won't see his apprentice grow up (in the dub, Kaze mutters, "I'm...done", while Roku begs Yuma to forgive him for his failure). Alito harshly tells Nistro to burn and suffer from the heat and boasts that his fists will burn him to pieces until the fires of malice reduce him to nothing (in the dub, Alito says it has been fun, but it's time to end the Duel). "Comet Cestus" fires a beam and Nistro is reduced to 0 Life Points. He says that the Duel was pretty exciting (in the dub, Nistro remarks that his temper got the better of him), but apologizes to Yuma for failing to pay the Barians back and repay his debt to Yuma. Dumon tells Dextra she fought well, but tells her to rest now as his attack blasts her backwards.

Quattro struggles against Nash even after the other Emperors have dispatched their opponents.

As she fades, she calls herself pathetic for being unable to stall longer. Marin tells Bronk that she acknowledges the feelings he sent her in this Duel, but calls them nothing more than a nuisance right now. Bronk curses, saying he had to win for Yuma's sake - he was supposed to return to Yuma with Rio at his side. As his soul flies towards the Barian World, tears stream down Marin's face. The screens vanish and Nash tells Quattro that every one of his friends has been defeated. Their bodies were crushed, twisted and broken, helpless before the overwhelming power of the Barians. Quattro simply hangs his head and Nash tells him that it's his turn. He asks if Quattro's heart has now broken (in the dub, Nash asks Quattro if he is still trying to change him, or if he has seen how wrong he was). Clenching his fist, Quattro angrily responds that he can scarcely believe how far Nash has fallen - to become this vile of a demon with a heart beyond saving. Nash thinks that this is a good sign and urges Quattro to hate him as a Barian. He believes that by defeating Quattro, he can bury the last link to "Reginald Kastle" (in the dub, Nash urges Quattro to make this a Duel neither of them can forget). Quattro mutters "Reginald", but finally yells that he's no longer Reginald Kastle (in the dub, Quattro declares that he lost an old friend, but gained a new enemy). Nash responds that he's right; he is Nash now. He urges Quattro to continue as his Barian Emblem glows and he resumes his Barian form. His voice adopting a demonic tone, he tells Quattro he'll join his friends in hell soon.

Turn 5: Quattro
Quattro equips "Shadow Feeler" with "Overlay Satellite", whose effect allows the equipped monster to be treated as two monsters when it is used as an Overlay Unit. It will also be attached to the Summoned Xyz Monster as an Overlay Unit, but the Summoned monster will be unable to attack this turn. Using these effects, Quattro overlays his two Level 8 monsters to Xyz Summon "Number 40: Gimmick Puppet of Strings" (3000/2000) in Attack Position. He then activates its effect, detaching an Overlay Unit to place a String Counter on "Silent Honor DARK". Since "Shadow Feeler" was used as an Overlay Unit and was sent to the Graveyard, it is instead banished via its own effect. As a card in his possession was banished, Quattro activates "Banish Reactor", letting him add a Spell Card from his Graveyard to his hand.

He adds "Rank-Up-Magic Argent Chaos Force" and activates it, Ranking Up "Gimmick Puppet of Strings" and performing a Chaos Xyz Evolution to Special Summon "Chaos Number 40: Gimmick Puppet of Dark Strings" (3300/2000) in Attack Position. He activates its effect, which allows him to destroy all monsters on the field with String Counters, and inflict damage to the controller equal to the combined original ATK of each of their destroyed monsters. "Silent Honor DARK" is destroyed (Nash 3000 → 200). Quattro activates the other effect of "Gimmick Puppet of Dark Strings", which allows him to draw a card when it destroys a monster by battle or by using its effect. As "Silent Honor DARK" was destroyed and sent to the Graveyard while it had Overlay Units, Nash activates its effect, Special Summoning it (2800/1500) from the Graveyard and gaining Life Points equal to its original ATK (Nash 200 → 3000). "Gimmick Puppet of Dark Strings" attacks "Silent Honor DARK", but Nash activates his face-down "Overlay Connection", which allows him to target a face-up Xyz Monster he controls that has no Overlay Units and attach this card to that target as an Overlay Unit. The attack continues and "Silent Honor DARK" is destroyed (Nash 3000 → 2500), so Quattro draws a card via the effect of "Gimmick Puppet of Dark Strings". As "Silent Honor DARK" was destroyed when it had Overlay Units, Nash activates its effect, Special Summoning it (2800/1500) and gaining Life Points equal to its original ATK (Nash 2500 → 5300). Quattro Sets a card.

Turn 6: Nash
Nash activates the effect of "Silent Honor DARK", attaching "Gimmick Puppet of Dark Strings" to it. As a face-up Xyz Monster he controls was targeted by the opponent's card effect, Quattro activates his face-down "Panic Shuffle", changing all Attack Position monsters to Defense Position and shuffling all Spell and Trap Cards in both players' Graveyards into their Decks. The battle positions of the affected monsters may not be changed until the End Phase. Nash Sets a card.